I cannot update my ipad

The latest iPadOS version is 16.2

If you want to update wirelessly, make sure to have enough free space on your device, at least 6GB.

Updating by using the computer will take less available free space.

Update your iPhone or iPad - Apple Support

Also make sure not to use a VPN or Firewall, when checking for updates.

If an app or feature on your device is not working or is restricted, it may have been disabled using Screen Time, or by an IT administrator if you are using a device owned by an employer or educational institution. See how to use Screen Time on an iPhone, iPad, or iPod touch by clicking here --> Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support

Related information about how to use parental controls on your child's iPhone, iPad, and iPod touch to restrict access to features --> Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support